Process of treating photographic or other prints.



No. 741,198. PATENTBD OUT; 13, 1903. W. P. WARREN.

PROCESS OF TREATING PHOTOGRAPHIG 0R OTHER PRINTS. APPLIUATION' FILED JULY 18, 1900. v N0 MODEL.

WITNESSES: INVENTOR lVaZZezzP. lWarnsva Hi5 ATTORNEY.

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NITED TATES Patented October 13, 1903.

Pater rerun.

WVALTER P. WARREN, OF NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 741,198, dated October 13, 1903.

Application filed July 13, 1900. seen No. 24,025. (No p imens.)

To aZZ whom} it may concern:

Be it known that I, WALTER P. WARREN, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Processes of Treating Photographic or other Prints, of which the following is a specification.

My invention relates to a process for treating photographic or other style of print.

More particularly my process is to make a print permanently transparent in order that it may be colored on its back. I will describe such'a process embodying my invention and then point out the novel features thereof in the claims.

In proceeding with my process I take any photographic print, glazed or no glazed, or any other style or form of print and render the material on which the print is made transparent. This is preferably accomplished by applying to the back of the print a mixture of clear oil and transparent varnish. I preferably employ pure castor-oil and mastic-varnish and in the proportion of one-third oil and two-thirds varnish. In cases of thick material the proportion of oil is increased. This mixture of oil and varnish is applied in such quantity as to render the material transparent. After the mixture of clear oil and clear varnish has dried the transparent print may be used as a negative from which photographic or other prints may be made in the usual way.

My process also has reference to making printing-negatives from sensitized paper. This may be accomplished by reflecting light within a closed chamber from an object within the chamber through a lens onto a sensitized surface on paper which is in a dark room. After exposure the paper and sensitized surface is developed in the same manner as an ordinary plate and then treated with the solution of oil and varnish to make it transparent. The mixture of oil and varnish also tends to harden the surface to which it is applied. In thecase of paper negatives, therefore, there would be little danger of scratching or otherwise marring the surface.

The above-described method of making prints of objects is particularly desirable, especially where a large print is desired of any object. The print so treated may then be colored, tinted, or painted and then mounted on a card. In case the print is to be projected it need only be colored or painted coarsely in flat tints. Oil or water colors may be used. After it has been colored or painted it may be varnished and then placed on any desired colored mount. The color is preferably applied to the back of the print. Where a great number of prints are to be colored, it may be done from a transfer-stone in the usual way.

In the accompanying drawings, Figure 1 is a-front view of a print. Fig. 2 is a cross-sectional View of the same. Fig. 3 is a front view of the same print on a mount. Fig. tis a cross-sectional view of Fig. 3.

The print A is first vmade transparent by the application of the oil and varnish. This print may be of any kind and made in any desired way. In this state it may be used as a negative from which to make duplicate prints. In case the print is to be colored and then mounted color or colors b are applied to the back CL and the colored print then placed on a mount B.

What I claim as my invention is- 1. The process herein described of treating prints, which consists in hardening the back of the same by applying thereto a mixture of clear oil and transparent varnish to render the print permanently transparent, then coloring the back of the transparent print, and finally placing the colored and transparent print on a suitable mount, substantially as set forth.

2. The process herein described of treating prints, which consists in applying to the back thereof a mixture of castor-oil and masticvarnish in the proportion of one-third oil and two-thirds varnish to render the print permanently transparent, then coloring the back of the transparent print, and finally placing the colored and transparent print on 'a suitable mount, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WALTER P. WARREN. Witnesses:

Gno. E. Gauss,

GEo. H. RAYMOND. 

